The Sacrifice (L4D2) No Mercy

[GMO]

My wife and I played a co-op offline No Mercy Campaign and we called the radio on the rooftops and the wipe outline went away and there was no audio and actually we haven't had any audio from the survivors or hear any sound effects. But when we do a L4D2 campaign we here everything. Could the finale possible be glitched? I am currently re-running it right now but just wanted to know if anyone else is experiencing the same thing?

[BillzNoLongerHere]

There hasn't been any official reports of this repeatedly cropping up, so I'm afraid to say you may have just gotten a tad unlucky.

valve recently patched after several disasterous glitches made the new DLC unplayable, so with any luck it should be okay now...